题目内容

The piston _____connects the piston to the connecting rod.

A. rod
B. pin
C. flange
D. body

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The piston is fitted with _____piston rings.

A. four
B. three
C. two
D. one

The top two rings seal the piston to the cylinder wall and prevent _____ from entering the crankcase.

A. air-fuel mixture
B. combustion gases
C. excessive fuel
D. excessive oil

The connecting rod is attached to the piston by the _______

A. piston rod
B. piston pin
C. cap bolts
D. cap bearing

The bottom ring prevents excessive oil from entering the combustion chamber from the______ .

A. oil pan
B. crankcase
C. fuel tank
D. water pump